Petroglyph J21 Khatm Al Melaha, Kalba, Sharjah

Natural Version with Paint, Petroglyph J21 Khatm Al Melaha, Kalba, Sharjah. Four poorly defined animals. Likely Neolithic or earlier. [Fossati 2019 Messages from the Past: Rock Art of the Al-Hajar Mountains (Oman)]. Khatm Al Melaha is an archaeological site on the coast of the Oman Sea near Kalba in Sharjah, UAE. It is one of the largest rock art sites in the UAE. Over 175 stones with petroglyphs were documented and close to 400 motifs were identified. Every rock with a glyph was given an ID number and a GPS coordinate. In total 25455 terrestrial photographs, 5244 drone photographs, 44 drone videos, and 182 GPS points (+/- 1cm) were done in a single day. Petroglyphs were identified using Radiance Scaling in Meshlab, materials lighting in Substance Painter, and by changing conditions in Sketchfab. Some carvings were completely invisible when viewing. Drawings were done only when a line could be identified using one of these techniques. Reality Capture and Substance Painter Source: Objaverse 1.0 / Sketchfab带彩绘的自然遗存：哈塔姆·阿尔·梅拉哈（Khatm Al Melaha）J21号岩画，沙迦卡巴（Kalba）。该遗存包含4只轮廓模糊的动物形象，年代推测为新石器时代或更早。[引自Fossati 2019年《来自过去的讯息：哈杰尔山脉（阿曼）岩画》] 哈塔姆·阿尔·梅拉哈（Khatm Al Melaha）是阿联酋（UAE）沙迦（Sharjah）卡巴（Kalba）附近阿曼海沿岸的一处考古遗址，亦是阿联酋境内规模最大的岩画遗址之一。 该遗址已记录超过175块带有岩画（petroglyph）的石材，辨识出近400个岩画母题。每一块带有刻痕的岩石均被赋予唯一编号与GPS坐标。单日累计完成了25455张地面摄影照片、5244张无人机航拍照片、44段无人机航拍视频，以及182个精度达±1cm的GPS测量点。 本次岩画辨识工作借助MeshLab中的辐射缩放（Radiance Scaling）功能、Substance Painter的材质光照设置，以及Sketchfab的场景条件调整功能完成。部分岩刻在常规视角下完全不可见，仅当通过上述某一技术可识别出轮廓线条时，才会进行绘图记录。 数据处理使用Reality Capture与Substance Painter 数据集来源：Objaverse 1.0 / Sketchfab